SU1327258A1 - Device for complex relay protection of electrical installation - Google Patents

Description

rectangular pulses. On the basis of the arrangement P1STV, a complex device of relay protection can be implemented. Its speed and accuracy are fully determined according to the Invention relates to electrical engineering and can be used in a complex relay protection device, made on the elements of analog computing, and to build digital protection.

The purpose of the invention is to increase speed.

Figure 1 shows the structural diagram of the proposed device; Fig. 2 shows an embodiment of the conversion channel.

The device for integrated relay protection of an electrical installation contains blocks 1 for measuring quadrature components, block 2 for control and conversion unit 3. The number of blocks for measuring quadrature components is equal to the number of signals supplied.

Each of the quadrature component measurement units contains an input first switch 4 and three output - second 5, third 6 and fourth 7 switches, two measuring channels 8 and 9 5 containing three frequency filters 10, 11 and 12, with a common output 13 of the input switch 4 is the first input of block 1, the first switching pin 4 of input switch 4 is connected to the inputs of the first measuring frequency filters

channel

The second switching pin 15 of the input switch 4 is connected to the inputs of the frequency filters of the second measuring channel 9. The 6 pins 13 of the output of the second 5, third 6 and fourth 7 switches are connected respectively to the first, second and third su 5thors 6 and 17 5 the outputs of block I.

The first switching pins 14 output switches 5-7 are connected respectively to the outputs of the third

indicators of the quadrature component measurement unit. In this case, the speed of the measurement unit of the quadrature stacking device is 20 ms. 2 Il.

0

five

0

12, the second II and the first 10 frequency filters of the first measuring channel, the second switching pins I5 of the output switches 5-7 are connected respectively to the outputs of the first 10, second 11 and third 12 frequency filters of the second measuring channel.

Control unit 2 contains a generator of 18 rectangular pulses and an inverter 19. Generator 18 output is the first output of the control unit and connected to the second input of each of the measurement units 1, which is connected to the inputs of the zero initial conditions of the frequency filters of the first measuring channel 8 and with control inputs of input 4 and output 5-7 switches. The output of the inverter 19 is the second output of the control unit and is connected to the third input of each of the measurement units 1, which is connected to the inputs for setting zero initial conditions of the frequency filters of the second measuring channel 9.

The conversion unit 3 contains two transforming devices 20 and 21 for each of the 1 measurement units. The cell of the converter units 20 (2i) contains five fifth input and sixth 23 output switches and two analog storage units-24 and 25,

The common terminals 13 of the input switches 22 of the first 20 and second 21 transducers of the 1st organs are connected respectively to the outputs of the adders 16 and 17, which are the outputs of one of the measurement units 1.

The switching ports 14 and 15 of the input switch {mutator 22 are connected to the inputs of the analog storage units 24 and 25, the outputs of which are connected to the switching terminals of the output switch 23.

five

0

35

40

The control inputs of the input 22 and output 23 of the switches are connected respectively to the first and second outputs of the control unit 2.

Commonly, the outputs of the output switches 22 of the converter units are the outputs of the converter unit 3.

In control block 2, a generator of 18 rectangular pulses with equal arrival times in both stable states T and

with an adjustable period T 2 generated signal. The latter is due to the need to detuning from the information of the previous mode of the protected object in the absence of a relay protection device of the launch organs. At the same time, reducing the period of the generated signal T leads to an increase in speed (2p -1) Tp, 2nTto the first measuring channel B is connected to the input of the device 2Q and to the inputs of the adders 16 and 17 through the first switching pins 14 of the switches, and on the filters of the second measuring channel 9 create a device.

At the processing time of the supplied signal equal to the period of industrial 25, zero initial conditions are given, the frequencies Tp 2 / i) required for this direction on the code of detuning from the forced harmonic filters 10–12 measuring channels

and free components, it is necessary to sum the n 2Tr / T values of the output voltages of the blocks

1, which is performed programmatically in a computing unit of a digital protection device and with the help of analog sampling-storage devices when implementing a computing unit by means of analog computing technology.

The device works as follows.

The generator 18, when the pulse duration Tu equal to the period of the industrial frequency T, generates a control signal in the form of Repeating pulses of positive and negative polarity of the same duration Tu TO, which is fed to the first output of the control unit 2. At the second output of control unit 2, this signal is fed through inverter 19. Thus, at the outputs of control unit 2, there are two control signals of the same type shifted relative to each other by a time equal to the pulse duration Tu. From the first output of the block

2controls the control signal is transferred to the control inputs of the switch 4-7, as well as to the outputs of setting zero initial conditions of the filters

27258

10-12 of the second measuring channel, and (the second output - only at the inputs of the installation of zero initial conditions of filters 10-12 of the first measuring channel.

At the same time, on the time interval (2пТд, (2п + 1) Tr), corresponding to the positive polarity of the first

10 of the control signal, to the input of the measurement unit of the quadrature components I and to the inputs of the adders 16 and 17 are connected via the second switching part 15 of the switches 4 to 7 of the second

5 measurement channel 9. On filters 10-12 of the first channel 8, zero initial conditions are created.

Respectively on the time interval

The first measuring channel B is connected to the input of the device 2Q and to the inputs of the adders 16 and 17 through the first switching pins 14 of the switches, and zero initial conditions are given on the filters of the second measuring channel 9 Сос 25. direction on the code of filters 10-12 of the measuring channel connected to the input of the unit 1 for measuring quadrature components at the moment of time that is away from the start of operation of this measuring channel by a time equal to the signal supplied to the device

five

0

1) (t) K (u), t-V) + + k1 i cos (Ku) ot - (J

2 k

And when using frequency filters 10-12 with transfer functions K. o (,)

one//

);

K „(p)

K. "(p)

P + S

Kj2.0

 d p +

TO

eleven

rc2o / p + ui

(2) (3)

where are you

6..s 2.5 (with e

but )

respectively, and about (TO) 0;

K v K

11 о - LS –р where K is the resulting transformation ratio of the primary current,

K-- to - -

. V g - T, and, (T,)

U .. (TJ

Voltages at the outputs of the adders 16 and I7 with the transfer coefficients of the adders 16 and 17 at the first inputs K

TO

I

f, -, and coefficients, the transmission of adders 9 and 10 through the third inputs

k-: and

to |

ABOUT

UI. (TO) to I, to I,

Un (To)

proportional to the quadrature components I o, IP current of the industrial frequency. Thus, the proposed device is completely rebuilt from the influence of interference in the form of forced harmonic components.

Selecting the transfer coefficients of the adders to the second inputs

To n

r --1

to

t-

the effect of the aperiodic component is almost completely eliminated.

When using the proposed device in a digital voltage relay protection device, the outputs of the quadrature measurement unit 1 units are converted using an analog-digital conversion unit 3 into a digital code and then the amplitudes of currents, voltages, active values and voltage values are determined from them. active. power components, resistances, etc. In this case, the discretization step of the analog-digital conversion unit -3 is equal in this period of the industrial frequency. In general, when using a generator of 18 rectangular pulses with a period of the generated signal equal to Tp 2 Tp / n, the discretization step of the analog-to-digital conversion unit is.

When implementing a computing unit by means of analog computing technology, conversion unit 3 is implemented based on the use of analog storage devices and electronic switches. The presence of the conversion unit in this case is due to the need to memorize at specified intervals of time apart from each other — 55 is connected via an intermediate input for the time Tj, information on the output converter to the corresponding quadrature measurement units of the measuring transformer, l The second and third inputs are related to the corresponding number of stored values. At first with the second and the second output

3272586

FIG. 2 shows the implementation of the conversion unit of the proposed device;

t%

T.

.y. switch inputs 22

five

0

five

5 2

connected to the first and switch 23, respectively, to the second outputs of the control unit 2. While analog storage units 24 of the conversion bodies are connected via the first switching pins 14 of the switches 22 and 23 to the inputs of the corresponding quadrature measuring units 1, analog storage units 25 transmitting through the second switching terminals 15 to the code of the conversion unit 3 information obtained during the previous cycle of operation of the measurement units of the quadrature components 1. And vice versa. Thus, the voltages at the outputs of the converter unit 3 vary over a period of the industrial frequency TQ.

.In the period of the signal generated by the control unit T g - 2T „/ n (with

Clause 7, 2), when the information at the outputs of the I measurement block of the quadrature components changes after a period of time equal to. It is necessary to use the more complex converter units 20 and 21 of the conversion unit 3..

Based on the proposed device and the computing unit, an integrated relay protection device can be made. Its speed and accuracy are fully determined by the corresponding indicators of the Q-Q honest measurement unit of the quadrature components, while the speed of the device is about 20 ms.

Claims (1)

Invention Formula five A device for integrated relay protection of an electrical installation, comprising a control unit, including a signal generator, blocks of quadrature components, the number of which is equal to the number of input signals, and a conversion unit, with the first input of each unit measuring the quadrature components Two control outputs and two outputs of each aforementioned block are connected to the corresponding inputs of the conversion block, each quadrature component measuring block including a measuring channel containing two frequency filters, characterized in that, in order to improve speed, the measuring block quadrature components introduced the second measuring channel, one input and three output switches, two adders, the third additional frequency filters in each of the measuring channels, in the unit pack The inverter is additionally inserted, and the signal generator is designed as a square pulse generator, with the first input of the quadrature measuring unit connected to the common output, the first input switch, the first and second switching outputs of which are connected to the frequency filter inputs of the first and the second measuring channel, the second input of the measurement unit of the quadrature components is connected to the control input of the first input switch and to the installation inputs of zero initial devices the frequency filters of the first measuring channel, the third input of the quadrature component measurement unit is connected to the inputs of the zero initial conditions setting of the TOTHbix filters of the second measuring channel; exits that are you 0 5 Q ,, five by the steps of the quadrature measuring unit, the first switching outputs of the second, third and fourth output switches are connected respectively to the outputs of the third, second and first frequency filters of the first measuring channel, and the second switching outputs of the second, third and fourth output switches are connected respectively to the outputs of the first , the second and third frequency filters of the second measuring channel, while the output of the signal generator is connected to the first output of the control unit and through the inverter, with the second output of the control unit, wherein the conversion unit contains two conversion units for each of the quadrature measuring units, each of the trans. educational bodies contain input fifth and output sixth switches and two analog storage units, the common input of the fifth input switch is connected by the input of the conversion body connected to one of the outputs of the quadrature measuring unit, switching the outputs of the input fifth switch through the analog storage units are connected to similar switching points of the output sixth switch, the common output of which is the output of the converter body, while the control The inputs of the input fifth and output switches are connected to the first and second outputs of the control unit, respectively. (. 20 (2t) 22 I1 Cjt5 2Ы .1 /four 25p4M 1L.-.- J at18out 6U from 2 bicod FIG. 2 Compiled by A. Bondarenko Editor M.Tovtin Tehred L.Oleinik Proofreader G. Reshetnik Order 3406/53 Circulation 617 Subscription VNIIPI USSR State Committee for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4